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2024 Vol.46, Issue 4 Preview Page

Article

Characteristics of Near-Inertial Oscillations in the East Sea using High-Resolution Surface Drifters at Hourly Intervals

한 시간 간격 고해상도 표층뜰개 자료를 활용한 동해 준관성진동 특성

Dongho Kim1
,
Eun-Joo Lee2
,
Chanhyung Jeon3*
김 동호1
,
이 은주2
,
전 찬형3*
1Department of Oceanography, College of Natural Sciences, Pusan National University, Busan 46241, Korea
2Department of Ocean Sciences, College of Natural Sciences, Inha University, Incheon 22212, Korea
3Department of Oceanography and Marine Research Institute, College of Natural Sciences, Pusan National University, Busan 46241, Korea
1부산대학교 자연과학대학 해양학과 (46241) 부산시 금정구 부산대학로 63번길 2
2인하대학교 자연과학대학 해양과학과 (22212) 인천시 미추홀구 인하로 100
3부산대학교 자연과학대학 해양학과 및 해양연구소 (46241) 부산시 금정구 부산대학로 63번길 2
*Corresponding Author
30 December 2024. pp. 155-165
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Abstract

Near-inertial oscillations (NIOs) in the ocean’s surface layer are primarily generated by wind, with a portion of the energy transferred below the mixed layer, contributing to vertical mixing. Previous studies on NIOs in the East Sea have been conducted using fixed-point Eulerian moorings or short-term Lagrangian observations. Recently, numerical models driven by high-resolution wind stress forcing with a temporal resolution finer than three hours have enabled detailed discussions of NIO characteristics over the East Sea. However, the temporal and spatial characteristics of NIOs covering the entire East Sea have not been thoroughly investigated based on observational data. This study analyzes 27 years of high-resolution Global Drifter Program (GDP) surface drifter data at hourly intervals and revisits the temporal and spatial characteristics of NIOs over the whole East Sea, alongside the reanalysis of data on wind and mixed layer depth. The average and median magnitudes of NIOs observed from the surface drifters over the entire period were 0.09 m/s and 0.06 m/s, respectively. Wind energy input, indicating wind-current resonance, and NIOs were stronger from July to December. Moreover, strong NIOs were observed across all seasons at locations where significant wind energy input was described. Notably, NIOs exceeding 0.7 m/s were observed primarily from July to September. The climatological monthly maximum of NIOs occurred in September, which was attributed to the strongest wind energy input (> 80 mW m-2), including the influence of typhoons, as well as shallow mixed layer depths (September mean of 18m). The decay timescale of NIOs was found to be approximately 4 days, with significantly longer timescales in the north of 39°N compared to the southern regions, as suggested in previous studies.

Keywords
near-inertial oscillations
wind energy input
temporal and spatial characteristics
GDP surface drifter
East Sea
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Information
  • Publisher :Korea Institute of Ocean Science and Technology
  • Publisher(Ko) :한국해양과학기술원
  • Journal Title :Ocean and Polar Research
  • Journal Title(Ko) :Ocean and Polar Research
  • Volume : 46
  • No :4
  • Pages :155-165
  • Received Date : 2024-10-11
  • Revised Date : 2024-12-07
  • Accepted Date : 2024-12-09
  • DOI :https://doi.org/10.4217/OPR.2024017
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